Discussion
In case of tire track, which of the following is not a class characteristic ?
Answer: A
Wear markings are not a class characteristic.
Class characteristics are features shared by every tyre of the same make and model: the tread design, the number and arrangement of the ribs (lands) and grooves, and their widths. They narrow the search to a type of tyre but cannot identify one tyre.
Wear is acquired in use. The way a particular tyre wears, together with cuts, embedded stones and repairs, is unique to it, so wear markings are individual (accidental) characteristics, the kind that can link an impression to one specific tyre. The other three options all describe the tyre's design, so they are class characteristics.
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